Nasolacrimal duct obstruction (NLDO) is a common ocular condition in the first year of life. As many as 95% of cases resolve spontaneously by one year of age. For those children in whom the condition does not resolve spontaneously, the initial surgical management is a probing of the nasolacrimal duct. Such a procedure is often successful, with cure rates up to 95%, especially in the first year of life. However, there are some patients in whom the initial procedure is not successful and repeat surgery is needed. Failure of an initial probing is thought to be associated with abnormal nasolacrimal anatomy, closure by healing of the surgical opening in the nasolacrimal duct, continued occlusion by the inferior turbinate, creation of a false passage, or faulty technique.